.main-introduction {
    display: flex;
    height: 80vh;
}

.bit-introduction {
    width: 50%;
}

.picture {
    width: 50%;
}

@media only screen and (max-width: 500px){
    .bit-introduction {
        width: 80%;
    }
}

.bit-introduction h1 {
    margin-top: 5rem;
    margin-bottom: 3rem;
    line-height: 2rem;
    font-size: 2rem;
}

.bit-introduction p {
    line-height: 2rem;
    color: #808080;
}

.bit-organization {
    padding-left: 0;
    height: 6vh;
    display: flex;
    width: 50%;
    list-style: none;
    justify-content: space-between;
}

.bit-organization li:hover {
    cursor: pointer;
    color: #002fa7;
    border-bottom: 0.3vw solid #002fa7;
    font-weight: 700;
}

@media only screen and (max-width: 500px){
    .bit-organization {
        width: 70%;
    }
}

.bit-organization li {
    height: 3vh;
    margin-bottom: 2rem;
    color: #808080;
}

.part {
    margin-top: 4rem;
    margin-bottom: 5rem;
    height: 0.3rem;
    width: 8rem;
    background-color: #fc9f4d;
}

.bit-sub {
    position: relative;
}

.bit-sub section {
    display: flex;
    justify-items: center;
    align-items: center;
    width:100%;
    height: auto;
    overflow: auto;
}

@media only screen and (max-width:500px) {
    .bit-sub section {
        height: 14rem;
    }
}

.bit-sub h2 {
    margin-bottom: 4rem;
}

@media only screen and (max-width:700px) {
    .bit-sub h2 {
        margin-bottom: 2rem;
    }
}

.bit-department section {
    position: relative;
}

.bit-kai {
    position: absolute;
    background-color: #ffffff;
    z-index: 100;
    overflow: hidden;
}

.bit-nei {
    position: absolute;
    background-color: #ffffff;
    z-index: 80;
    overflow: hidden;
}

.bit-zu {
    position: absolute;
    background-color: #ffffff;
    z-index: 60;
    overflow: visible;
}

.bit-gong {
    position: absolute;
    background-color: #ffffff;
    z-index: 40;
    overflow: hidden;
}


footer {
    font-size: 0.7rem;
    height: 10vh;
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.footsup {
    padding-bottom: 0.35rem;
    width: 80%;
    text-align: center;
    border-bottom:1px solid #d6d6d6;
}

.footsub {
    padding-top: 0.35rem;
}

@media only screen and (max-width: 735px) {
    .foot {
        margin-top: 15px;
    }
}


@media only screen and (max-width: 1068px) {
    .foot {
        margin-top: 20px;
    }
}